EDIT: Cos I apparantly violated the rules (fair cop BTW, not complaining), I'll elaborate. Only your eyes can tell the difference between videos. Metric comparisons can only go so far, and in my experience are wholly unreliable.

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On Discworld it is clearly recognized that million-to-one chances happen 9 times out of 10. If the hero did not overcome huge odds, what would be the point? Terry Pratchett - The Science Of Discworld

The question is whether the OP wants a tool that helps the user to compare videos visually or a program that will do the comparison automatically/mathematically without the help of human eyes

Of course the latter is not possible for most purposes! And I think that is what Sharktooth meant...

__________________There was of course no way of knowing whether you were being watched at any given moment.
How often, or on what system, the Thought Police plugged in on any individual wire was guesswork.

I'd suggest to you that "video Quality" is a subjective concept "in the eye of the beholder", because different viewers have different likes and dislikes regarding video - e.g. some prefer a softer image, some a sharper image, some prefer brighter colors, while others prefer "mellower" colors...

for who didnt get it... read the title again. only EYES can compare quality...

Yes, but there are programs to that can help your eyes. Like inspecting the video frame-by-frame and switching between different versions/encodes easily...

__________________There was of course no way of knowing whether you were being watched at any given moment.
How often, or on what system, the Thought Police plugged in on any individual wire was guesswork.

he asked for a "Program to Compare Video Encode Quality"
it does NOT exist. there are program based on commonly used quality metrics, but we all know they are not good for REAL quality comparison.
Infact x264 psy-RDO is crap for those programs, while, in reality, it enhances the perceved quality a LOT.
Only the eyes are good...

"Program to Compare Video Encode Quality" might also refer to a tool that shows the same frame from different encodes side-by-side or alternating, so you can compare the encodes more easy

__________________There was of course no way of knowing whether you were being watched at any given moment.
How often, or on what system, the Thought Police plugged in on any individual wire was guesswork.

he asked for something and not some other thing.
it's CLEAR he wants a PROGRAM that COMPARES QUALITY of different encodes... not a program that helps him to judge quality of different encodes. it doesnt exist. PERIOD.

he asked for something and not some other thing.
it's CLEAR he wants a PROGRAM that COMPARES QUALITY of different encodes... not a program that helps him to judje quality of different encodes.

IMHO that is not so clear. So we will have to wait for his answer...

__________________There was of course no way of knowing whether you were being watched at any given moment.
How often, or on what system, the Thought Police plugged in on any individual wire was guesswork.

__________________There was of course no way of knowing whether you were being watched at any given moment.
How often, or on what system, the Thought Police plugged in on any individual wire was guesswork.

i havent tried it yet with my 720p and higher encodes as i doubt i will have enough screen space

If it doesn't fit on your screen, stack horizontal and use "extended desktop" on two screens

__________________There was of course no way of knowing whether you were being watched at any given moment.
How often, or on what system, the Thought Police plugged in on any individual wire was guesswork.

__________________There was of course no way of knowing whether you were being watched at any given moment.
How often, or on what system, the Thought Police plugged in on any individual wire was guesswork.